@article{PORMA_1990__47_1_115695,
     author = {Matos, M\'ario C.},
     title = {Errata to the article },
     journal = {Portugaliae mathematica},
     pages = {13--13},
     publisher = {mathdoc},
     volume = {47},
     number = {1},
     year = {1990},
     mrnumber = {1079501},
     zbl = {0744.46034},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1990__47_1_115695/}
}